Car starter “jumper box” mod

Computers & Mobile

MAKE subscriber Todd Harrison sent us the link to this project he did, retrofitting a car jumper box with a 12v riding lawn mower battery instead of the $75 (plus shipping) drop-in replacement. The modded version cost him about $35.

Car starter “jumper box” mod

4 thoughts on “Car starter “jumper box” mod

  1. Mike Yancey says:

    The ‘official’ APC UPS (Un-interruptable Power Supply) batteries cost upwards of $50 for a single battery replacement, or $70 for a two-battery unit. But the very same gel batteries themselves can be had for around $20 to $25 each.

    Good to know someone else has found a good mod for these.

    Mike Y
    Dallas, Texas

  2. Shadyman says:

    I vote this as +1 “Handy” :)

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Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. His free weekly-ish maker tips newsletter can be found at

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